Fifty FBI agents arrived at the scene of the crash almost immediately, although the nearest FBI office was a 40-minute drive away -- additionally, fifty FBI agents would seldom be in one office, even in Chicago; they were usually out in the field, unless they had gathered together for a special project.

The pilot had a significant amount of cyanide in his blood. Although some said he could have inhaled cyanide from chemical reactions in the crash, others say that the 3.9 micrograms per milliliter in the pilot could only be the result of deliberate poisoning.

Nixon also appointed two of his close associates to the investigation, and another Nixon friend was soon after named to a position with United Airlines and was involved in every phase of the investigation.

Of course, the obvious argument against this whole conspiracy theory is that no one in the government would kill that many people just to eliminate one inconvenient witness to a crime that may never have occurred and then work so hard to cover it all up.